misc: nct1008: error handling change
[linux-2.6.git] / drivers / misc / ad525x_dpot-i2c.c
1 /*
2  * Driver for the Analog Devices digital potentiometers (I2C bus)
3  *
4  * Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
5  *
6  * Licensed under the GPL-2 or later.
7  */
8
9 #include <linux/i2c.h>
10 #include <linux/module.h>
11
12 #include "ad525x_dpot.h"
13
14 /* ------------------------------------------------------------------------- */
15 /* I2C bus functions */
16 static int write_d8(void *client, u8 val)
17 {
18         return i2c_smbus_write_byte(client, val);
19 }
20
21 static int write_r8d8(void *client, u8 reg, u8 val)
22 {
23         return i2c_smbus_write_byte_data(client, reg, val);
24 }
25
26 static int write_r8d16(void *client, u8 reg, u16 val)
27 {
28         return i2c_smbus_write_word_data(client, reg, val);
29 }
30
31 static int read_d8(void *client)
32 {
33         return i2c_smbus_read_byte(client);
34 }
35
36 static int read_r8d8(void *client, u8 reg)
37 {
38         return i2c_smbus_read_byte_data(client, reg);
39 }
40
41 static int read_r8d16(void *client, u8 reg)
42 {
43         return i2c_smbus_read_word_data(client, reg);
44 }
45
46 static const struct ad_dpot_bus_ops bops = {
47         .read_d8        = read_d8,
48         .read_r8d8      = read_r8d8,
49         .read_r8d16     = read_r8d16,
50         .write_d8       = write_d8,
51         .write_r8d8     = write_r8d8,
52         .write_r8d16    = write_r8d16,
53 };
54
55 static int __devinit ad_dpot_i2c_probe(struct i2c_client *client,
56                                       const struct i2c_device_id *id)
57 {
58         struct ad_dpot_bus_data bdata = {
59                 .client = client,
60                 .bops = &bops,
61         };
62
63         struct ad_dpot_id dpot_id = {
64                 .name = (char *) &id->name,
65                 .devid = id->driver_data,
66         };
67
68         if (!i2c_check_functionality(client->adapter,
69                                      I2C_FUNC_SMBUS_WORD_DATA)) {
70                 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
71                 return -EIO;
72         }
73
74         return ad_dpot_probe(&client->dev, &bdata, &dpot_id);
75 }
76
77 static int __devexit ad_dpot_i2c_remove(struct i2c_client *client)
78 {
79         return ad_dpot_remove(&client->dev);
80 }
81
82 static const struct i2c_device_id ad_dpot_id[] = {
83         {"ad5258", AD5258_ID},
84         {"ad5259", AD5259_ID},
85         {"ad5251", AD5251_ID},
86         {"ad5252", AD5252_ID},
87         {"ad5253", AD5253_ID},
88         {"ad5254", AD5254_ID},
89         {"ad5255", AD5255_ID},
90         {"ad5241", AD5241_ID},
91         {"ad5242", AD5242_ID},
92         {"ad5243", AD5243_ID},
93         {"ad5245", AD5245_ID},
94         {"ad5246", AD5246_ID},
95         {"ad5247", AD5247_ID},
96         {"ad5248", AD5248_ID},
97         {"ad5280", AD5280_ID},
98         {"ad5282", AD5282_ID},
99         {"adn2860", ADN2860_ID},
100         {"ad5273", AD5273_ID},
101         {"ad5171", AD5171_ID},
102         {"ad5170", AD5170_ID},
103         {"ad5172", AD5172_ID},
104         {"ad5173", AD5173_ID},
105         {"ad5272", AD5272_ID},
106         {"ad5274", AD5274_ID},
107         {}
108 };
109 MODULE_DEVICE_TABLE(i2c, ad_dpot_id);
110
111 static struct i2c_driver ad_dpot_i2c_driver = {
112         .driver = {
113                 .name   = "ad_dpot",
114                 .owner  = THIS_MODULE,
115         },
116         .probe          = ad_dpot_i2c_probe,
117         .remove         = __devexit_p(ad_dpot_i2c_remove),
118         .id_table       = ad_dpot_id,
119 };
120
121 static int __init ad_dpot_i2c_init(void)
122 {
123         return i2c_add_driver(&ad_dpot_i2c_driver);
124 }
125 module_init(ad_dpot_i2c_init);
126
127 static void __exit ad_dpot_i2c_exit(void)
128 {
129         i2c_del_driver(&ad_dpot_i2c_driver);
130 }
131 module_exit(ad_dpot_i2c_exit);
132
133 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
134 MODULE_DESCRIPTION("digital potentiometer I2C bus driver");
135 MODULE_LICENSE("GPL");
136 MODULE_ALIAS("i2c:ad_dpot");